Pith Number

pith:RTQTEYN7

pith:2017:RTQTEYN7QTV6NCPLOLBUDZZS5W

not attested not anchored not stored refs pending

Gustav Sp\"orer Was Not a Perfect Observer: Failure of the Active Day Fraction Reconstruction of Sunspot Group Numbers

Leif Svalgaard

arxiv:1705.06089 v1 · 2017-05-17 · astro-ph.SR

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{RTQTEYN7QTV6NCPLOLBUDZZS5W}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T00:34:29.183033Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8ce13261bf84ebe689eb72c341e732edaf053eb717a329e4c7e2756be5e2e862

Aliases

arxiv: 1705.06089 · arxiv_version: 1705.06089v1 · doi: 10.48550/arxiv.1705.06089 · pith_short_12: RTQTEYN7QTV6 · pith_short_16: RTQTEYN7QTV6NCPL · pith_short_8: RTQTEYN7

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/RTQTEYN7QTV6NCPLOLBUDZZS5W \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 8ce13261bf84ebe689eb72c341e732edaf053eb717a329e4c7e2756be5e2e862

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6c1486a23455a521918a1e3442ff2c413be4c65730fc93a432810afedffa8a62",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2017-05-17T11:06:55Z",
    "title_canon_sha256": "0682bbbd8a01a4958dbef267ee7ff980b04a86f7289cb2a538e2c0f6a0e7b993"
  },
  "schema_version": "1.0",
  "source": {
    "id": "1705.06089",
    "kind": "arxiv",
    "version": 1
  }
}